NASA astronauts Jessica Meir (left) and Christina Koch are inside the Quest airlock preparing the U.S. spacesuits and tools for use on their first spacewalk together. On Friday, Oct. 18, the Expedition 61 flight engineers used pistol grip tools to swap out a failed power controller, also known as a battery charge-discharge unit, that regulates the charge to batteries that collect and distribute power to the International Space Station. (NASA)
